Contact device.



G. BRENT. CONT-ACT DEVICE.

APPLICATION FILED NOV. 5, 1906.

928,934." Patented July-27, 1909.

2 SHEETS-SHEET l.

C. BRENT.

UONTACT DEVICE.

APPLICATION FILL 1mm, 1906.

928,934. Patented July 27, 1909.

2 SHEETS-SHEET 2.

M5555.- Jzz #5222272- QXXMTK. h

UN TED STAWENT OFFICE.

CHARLES BRENT, or BRANDON, MANITOBA, CANADA.

coN'rAc'r DEVICE.

Specification of Letters Patent. Patented July 27, 1909.

i Application filed November 5, 1906. Serial No. 342,014. I

To allwh'om it may concern:

.Be it known that I, CHARLES BREN'r, re-

siding at Brandon, in the Province of Mani-. toba and Dominion ofCanada, have invented a certain.new and useful Improvement in ContactDevices, of which the following is a full, clear, and exact description,reference being had to the accompanying drawings.

It is customary in many places such as in hotels, warehousesv andfactories to provide each of the rooms with, or so arranged indifferen't parts of such establishments, devices for operating asuitable annunciator at the office or in anyother desired place toindicate. the part of the building in which'afire is located, in case ofa fire breaking out. These devices have been quite numerous and have{given more or less satisfaction, but it has "'beenfound in practicethat they get out of order and do not-work just at the time when theyare most. needed. It is also-'afact that in most instances they are verydifficult to adjust and are not sufficiently sensitive in theiroperation.

It is the ob ect of this invention, therefore, to provide a'thermalloperated device,

which will operate a s uitab e annunciator andwill be easy of adjustmentoughly reliable.

lt is also a feature of this invention to pro vide a device which can beused with a-callbell system already in use in hotels and the gage thecontact, complete the circuit and in that way indicate upon theannunciator the lace where the device is in operation and the ocation ofthe fire.

The invention may be further briefly sum-' marized as consisting inconstructionand combination of parts hereinafter set forth in thefollowing descriptions, drawings and claims.

Referring to the drawings, Figure 1 is a detail view of thedevicewithsome of the as well as thorthe bar it wil nunciator may be empparts broken away to more clearly show the construction thereof, andFig. 2 shows the device applied to anelectrical iannunciator system.

In the drawings one form of the device is shown and it consists'of asupporting mem-' her 1 which may be made in the form of a plate tobesecured to the Wall or ceiling or.

may be supplied with a wood screw 2, which may be readily secured in thewood-work. This supporting member 1 is provided with a threaded openingfor receiving the shank 3 of a binding post 4 having an opening 5 forthe reception of one of the wires of the circiliitand a set screw 6 forholding the wire in p ace. ing in the thermostatic bar to be described,-to hold the same in place. The thermostatic bar above mentioned ispreferably made up of a strip 7 and astrip 8 secured together preferablyby soldering and bent into the :form of a loop as shown. The

The shank 3pa'sses through an open strips of-this bar are preferably ofmetals having diierent co-efiicientaof expansion and in practice I have'found that when the strip 7 is of steel without temper, and the strip.8 is of zinc, very good results, are obtained.

One end 9 .of the thermostatic bar ex tends beyond the supporting member1 where it is provided with an opening 10 adapted to receive aninsulating washer 11 surrounding a screw 12 passing through a .Washer 13and into a binding-post 14 in a manner such that all ofthe parts areclamped tightly to the bar. screw 16 serve to hold the other line of thecircuit. At the end of the binding-post 14 a contact screw 17 is rovidedand 1t is ar- The opening 15 and set ranged to be adjusted in and out asthe case" may be and he (1 in such adjusted position by means of a setscrew 18. Thethermostatic bar is arranged to form a loop or ring asshown and its end remains free to 006p crate with the contact screw 17which is more mally adjusted so that the bar is outof contact therewith.7

From the foregoing descriptions" it is obvious that upon the applicationof heat to 17, thus completing the circuit at this point. Any-preferredwiring for and form of an oyed, but a very efii- I expand and cause thefree end lto moveout and engage the contact screw cient form is shown inthe drawing wherein the Wire 20 represents the ground wire connected toall parts of the building, to the binding-post 14 of each contactdevice, and to the battery 21. The wire 22 connects the battery with theannunciator 23 and a wire "In a hotel where call-bell systems are al'ready installed, one of these devices may be inserted in the circuit ineachroo'm and in case of fire the device will operate in the manneralready described. Thecall-bell will ring at the office and willcontinue to ring as long as the bar holds the circuit closed or as longas the hightem erature continues. From this the clerk wil know thatthere is probably a fire in the room corresponding to the indicatingdevice on the annunciator.

1. In a contact device, incombination, a support, a binding post carriedthereby, a thermostatic bar secured intermediate of its ends to saidpost and having one of its free ends bent around to form a loop, a cointact screw mounted in and insulated from the other one of the ends ofsaid bar, the end of the loop being adapted to normally remain out ofengagement with said contact but. when heated to engage the same; saidbar being composed of two strips of metal secured together and havingdifferent co efficients of expansion.

2. In a contact device, in combination, a

support, a post carried by said support, a

thermostatic bar secured near :oneend to said support and having itsother end bent around in the form of a loop said loop being composed oftwo strips of metal secured together and having different coefficientsofexpansion, the one with the greater expansion being arranged on theinside of the loop, a contact screw mounted inthe end of said bar-andada ted to be engaged by the free end of said oop, said free end beingnormallyout of contact with said screw, and means for holding saidcontact screw in any adjusted position.

lntestimony whereof I aflix my signature in the presence of twowitnesses. Havlng described my inventlon, I cla1m L CHARLES BRENT.

' VVitnessesL JosEPH E. GAVIN,. J OHN M. Pnovoosr.

